Estimation of Underground River Water Availability Based on Rainfall in the Maros Karst Region, South Sulawesi

摘要

Maros karst region covering an area of 43.750 hectares has water resources that determine the life around it. Water resources in Maros karst were in the rock layers or river underground in the cave. The data used in this study are primary and secondary data. Primary data includes characteristics of the medium. Secondary data were rainfall data from BMKG, water discharge data from the PSDA South Sulawesi province in 1990-2010, and the other characteristics data karst Maros, namely cave, flora and fauna of the National Park Bantimurung Bulusaraung. Analysis the data used laboratory test for characteristics of the medium Maros karst, while rainfall and water discharge were using Minitab Program 1.5 to determine their profile. The average rainfall above 200 mm per year occur in the range of 1999 to 2005. For the availability of the water discharge over 50 m3/s happened in 1993 and 1995. Prediction is done by modelling Autoregressive Integrated Moving Average (ARIMA), with the rainfall shows that the average precipitation for four years (2011-2014) will fluctuate sharply. For the prediction of water discharge in Maros karst region for the period from January to August in 2011, including the type of 0. In 2012, increase of the water discharge until early 2014.